public void Added_Child_Should_Have_VisualParent_Set()
{
var target = new TestVisual();
var child = new Visual();
target.AddChild(child);
Assert.Equal(target, child.GetVisualParent());
}
public void Removed_Child_Should_Have_VisualParent_Cleared()
{
var target = new TestVisual();
var child = new Visual();
target.AddChild(child);
target.RemoveChild(child);
Assert.Null(child.GetVisualParent());
}
public void Adding_Already_Parented_Control_Should_Throw()
{
var root1 = new TestRoot();
var root2 = new TestRoot();
var child = new TestVisual();
root1.AddChild(child);
Assert.Throws <InvalidOperationException>(() => root2.AddChild(child));
Assert.Equal(0, root2.GetVisualChildren().Count());
}
public void Clearing_Children_Should_Clear_VisualParent()
{
var children = new[] { new Visual(), new Visual() };
var target = new TestVisual();
target.AddChildren(children);
target.ClearChildren();
var result = children.Select(x => x.GetVisualParent()).ToList();
Assert.Equal(new Visual[] { null, null }, result);
}
public void Added_Child_Should_Notify_VisualParent_Changed()
{
var target = new TestVisual();
var child = new TestVisual();
var parents = new List <IVisual>();
child.GetObservable(Visual.VisualParentProperty).Subscribe(x => parents.Add(x));
target.AddChild(child);
target.RemoveChild(child);
Assert.Equal(new IVisual[] { null, target, null }, parents);
}
public void Removing_Children_Should_Fire_OnDetachedFromVisualTree()
{
var child2 = new TestVisual();
var child1 = new TestVisual {
Child = child2
};
var root = new TestRoot();
var called1 = false;
var called2 = false;
root.Child = child1;
child1.DetachedFromVisualTree += (s, e) => called1 = true;
child2.DetachedFromVisualTree += (s, e) => called2 = true;
root.Child = null;
Assert.True(called1);
Assert.True(called2);
}
public void Adding_Children_Should_Fire_OnAttachedToVisualTree()
{
var child2 = new TestVisual();
var child1 = new TestVisual {
Child = child2
};
var root = new TestRoot();
var called1 = false;
var called2 = false;
child1.AttachedToVisualTree += (s, e) => called1 = true;
child2.AttachedToVisualTree += (s, e) => called2 = true;
root.Child = child1;
Assert.True(called1);
Assert.True(called2);
}